切削工具对硬金属加工的影响

选择有效的切削工具为高速加工硬质模头钢提供了有效、简便的加工工艺。     

国外塑料加工工业生产技术发展动向

围绕国外塑料加工工业近期生产技术的进展,扼要评述了塑料原料、助剂的生产发展动向;几个国家和地区塑料加工工业的发展概况;塑料产品构成及发展动向;新工艺、新技术、新产品的开发以及废旧塑料回收再用的法规。简要分析了今后发展动向。     

日本模具加工的最新发展方向

据日本大阪加工技术开发中心主管技师若冈俊介博士介绍，日本模具加工的4个发展方向为无人手修磨、无放电加工、加工时间缩短及五轴加工。     

浅析影响电火花大面积加工的因素及解决办法

本文通过对一套模具利用电火花机床进行加工的过程中所遇到的一些问题的分析以及解决方法的讨论，提出了一些电火花大面积加工中影响加工的因素和消除这些因素对加工的影响的方案。     

Gelimat混料加工装置

据美国 Draiswerke公司介绍 ,该公司利用热动力学原理开发的全自动加工控制 Gelimat混料加工装置 ,可在极短的时间内对多项加工参数进行调整改动。　　Gelimat混料加工装置可在几秒钟内完成搅拌、混合、加热混料等一系列操作过程 ,因此 ,聚合物的加热过程极短 ,可防止聚合物的降解。物料受热可在5～ 2 0秒钟即达到熔融温度 ,然后再输送到成型区。　　 Gelimat混料装置可用于加工 PE、UHMWPE、PP、PVC、PVDC、ABS以及几乎所有的热塑性树脂和热固性树脂 (包括合金、高填充或纯树脂 )。Draiswerke公司称 ,价廉的回收料可以熔融或与木…     

国内外模具制造技术的新发展

激光因具有单色性、相干性和平行性三大特点,特别适用于材料加工.激光加工是激光应用最有发展前途的领域,国外已开发出20多种激光加工技术.激光的空间控制性和时间控制性很好,对加工对象的材质、形状、尺寸和加工环境的适应性很强,特别适用于自动化加工.     

工业陶瓷精密加工技术的研究现状

工业陶瓷具有高强度、高硬度、耐高温和抗腐蚀等优异性能,在机械电子、航空 航天、军事国防等领域有着广泛的应用。陶瓷产品存在高脆性的特点,在工业陶瓷加工时会出 现裂纹和崩溃等问题。在过去几十年中,改善传统机械加工技术、应用新型特种加工技术以及 研究复合加工技术方法成为一个共同关注的问题,研究成果在提高工业陶瓷的加工效率、保证 陶瓷产品表面完整性方面发挥出了积极的作用。本文总结了工业陶瓷精密加工技术研究进展。     

电火花加工中影响成型面加工质量因素的分析

本文从电火花加工实际出发，分析了电火花加工中影响成型面加工质量的各种干扰因素，提出了稳定放电加工。提高加工质量的相应措施以及获得最佳加工效果的途径。     

2006国外塑料加工技术进展

本年度报告综述了主流媒体2006年报道的塑料加工新工艺、新技术,重点是挤出、注射、吹塑、流延、热成型等几大基础加工工艺。应该指出的是,市场是新技术的孵化器,由于消费市场对塑料制品性能要求的不断提高,促使传统加工技术的革新不止,一些看似“老旧”的工艺融入了高新科技含量,已不可同日而语。此外,原材料商家为了迎合市场需要,紧密结合现代加工技术不断推出专用料、特种料,本刊视之为一种新的技术发展趋向,也作了归纳。     

辅助加工技术的革命

辅助加工在塑料加工生产中具有举足轻重的作用，如今，领先的辅助加工设备供应商已经将“柔性化、自动化、集成化”的辅助加工理念带进了客户的生产工厂，以期帮助客户更好地实现“高效、高质、低成本”的生产目的，而处于塑料产品生产最末端的辅助工序——喷码技术的进步，则为塑料制品添加了“防伪”的功能，[编者按]     

Progress in non-traditional machining of amorphous alloys

Amorphous alloys are a new type of multi-functional advanced material with the properties of general metal materials and glass, which are also called metallic glasses. They have good comprehensive properties, such as a wide application range, low cost, and high reusability. Using reasonable process parameters, non-traditional machining can not only realize the machining of complex amorphous parts, but also avoid the crystallization and oxidation of amorphous alloys, realizing tasks that cannot be accomplished by traditional machining. Therefore, this review systematically summarizes the research status and development potential of amorphous alloys fabricated using non-traditional machining methods. First, we introduce the principles of laser machining, ultrasonic machining, electrical discharge machining, electrochemical machining, and other non-traditional machining methods for amorphous alloys. Subsequently, the influence of the machining parameters and other external conditions on the machining effect is summarized. The machining cost, machining efficiency, and environmental impact of these non-traditional machining methods were compared. Finally, non-traditional machining technology for amorphous alloys is summarized and discussed.     

Prospects for improving machining productivity of large ceramic objects for radio engineering purposes

Contemporary machining methods for ceramic materials are analyzed. Laser, hydroabrasive and high-speed machining are considered. The possibility of using these methods for machining large complexly-shaped ceramic objects having a double surface curvature is evaluated.     

Damage formation and suppression in rotary ultrasonic machining of hard and brittle materials: A critical review

Rotary ultrasonic machining (RUM) combines diamond grinding with small-amplitude tool vibration, to improve machining processes of hard and brittle materials. It has been successfully applied to the machining of a number of brittle materials from optical glasses to advanced ceramics as well as ceramic matrix composites. The emphasis of this literature review was on formation mechanism and suppression methods of machining induced damages that truly limit RUM machining efficiency improvement of brittle materials. In this review paper, material removal mechanism and cutting force modeling of RUM of brittle materials were presented, as well as all corresponding roles in the damage formation process. The critical processing capacity of RUM machine tools was described, which guarantees the RUM effectiveness and consequently constitutes the boundary condition of processing parameters determination. Formation mechanisms of edge chipping, tearing defects, subsurface damages, and their interactive effects were summarized. Advances in damage suppression methods were also described, including optimization of processing parameters, tool design of low damage, and other methods such as rotary ultrasonic elliptical machining.     

Multiresponse Optimization for Laser-Assisted Machining of Fused Silica Using Response Surface Methodology

Silicon - Fused silica is difficult to machine using conventional machining methods mainly owing to its high brittleness and strength. Laser-assisted machining (LAM) provides desirable process for...     

超硬材料加工技术发展现状及趋势

介绍了超硬材料常用特种加工方法和机械加工方法，各种方法的发展现状及趋势等。     

A review on machining of carbon fiber reinforced ceramic matrix composites

Carbon fiber reinforced ceramic matrix ceramic/polymers composites have excellent physical-mechanical properties for their specific strength, high hardness, and strong fracture toughness relative to their matrix, and they also possess a good performance of wear resistance, heat resistance, dimensional stability, and ablation resistance. It is a choice for thermal protection and high temperature structural materials. However, this kind of composites owning characteristics of high hardness and abrasion is difficult to machine which impedes the large-scale industrial application of manufacturing. This paper mainly reviews the research on machining status of carbon fiber reinforced ceramic matrix composites including carbon fiber reinforced polymer matrix composites from the aspects of conventional machining and unconventional machining method. The machining trends, problems existing in various machining methods and corresponding solutions are generalized and analyzed.     

顺丁橡胶装置悬臂轴的车削工艺

对大庆石化公司顺丁橡胶装置膨胀干燥机悬臂轴的材料和结构特性进行了分析，制定了科学合理的机械加工工艺方法和专用工装夹具，完成了该轴的国产化加工任务。为同类型工件的加工提供了科学有效的依据。     

Improving quality and machining efficiency of hole during AlN trepanning with nanosecond pulse laser

Aluminum nitride (AlN) is essential material to electronics industry. Compared to traditional machining methods, laser trepanning has become one of the most popular options for hole machining on AlN. Due to involvement of multiple parameters, such as scanning number, laser beam jump direction, scanning mode, and filling circle interval, the optimization of hole quality is complex. To tackle this problem, this paper systematically studied hole trepanning on AlN using nanosecond pulse laser in order to examine the relationship among trepanning parameters and hole dimensions, quality, and machining efficiency. Thereby, the optimized combination of parameters could be obtained to improve the quality and efficiency of hole machining. Moreover, possible effect mechanisms like effect of laser fluence on hole diameters, effects of jump directions and scanning modes on hole machining quality were discussed. Most importantly, it is the first time that the relationship among trepanning parameters, hole quality, and machining efficiency is presented.     

Composite machining damage quantification using thermoelastic stress analysis

A new experimental method is presented for quantifying machining damage in polymer matrix composites. The method consists of capturing infrared images of machined samples and using thermoelastic stress analysis to quantify damage from the machining event. A modified stress concentration factor is presented as an easily measured and useful damage parameter. Circular holes were drilled into the center of plate specimens fabricated from a commercially available glass fiber reinforced composite. A standard drill bit, brad point drill bit, and abrasive water jet machining were the three machine tools investigated. Infrared images were used to quantify the machining damage by assigning a thermoelastic stress analysis based stress concentration factor (mSCF) to each machined hole. The mSCF was then used to rank the damage inherent to each machining method. Optical and electron microscopy were utilized to identify the types of damage associated with the three machining methods. Finally, each sample was fatigued to failure to substantiate the IR results. The ranking of damage based upon the mSCF was in good agreement with the fatigue lifetime rankings: higher mSCF is associated with shorter fatigue lifetimes.     

Effect of focusing flow on stationary spot machining properties in elastic emission machining

Ultraprecise optical elements are applied in advanced optical apparatus. Elastic emission machining (EEM) is one of the ultraprecision machining methods used to fabricate shapes with 0.1-nm accuracy. In this study, we proposed and experimentally tested the control of the shape of a stationary spot profile by introducing a focusing-flow state between the nozzle outlet and the workpiece surface in EEM. The simulation results indicate that the focusing-flow nozzle sharpens the distribution of the velocity on the workpiece surface. The results of machining experiments verified those of the simulation. The obtained stationary spot conditions will be useful for surface processing with a high spatial resolution.